Abundance estimates of P as a function of optical depth (τ₅₀₀₀). Abundances for individual lines are shown as points where the optical depth in the line center reaches unity. The horizontal bar extends to where the optical depth in the line center is 0.1 to illustrate the range of depths relevant for line formation. Vertical errors are the statistical uncertainty on the abundance. The red line is the best (median) linear P distribution from directly fitting all observed P lines simultaneously. The light gray lines represent individual models from the Markov chain, with darker gray areas corresponding to a higher probability density.